????? ????? ????? ???? ???? ???????? ?? ?? ???? ??? ?????? ???????? ???? ??? ????????????? ??? ?? ?????? ??? ?? ???????, ?????????? ???? ????? ??? ???? ??????? ??? ??????? ??? ??? ????? ???.Products with several switches (including a pc keyboard) normally organize these switches inside of a scan matrix, with the individual switches around the inter